The three shots ripped through the close night air of the prison, sharply, unbelievably. Three guards crumpled like puppets in the dead silence that followed. The thought flashed through Krenner's mind, incredibly, that possibly no one had heard. He hurled the rope with all his might up the towering rock wall, waited a long eternity as the slim strong line swished through the darkness, and heard the dull "clank" as the hook took hold at the top. Like a cat he started up, frantically, scrambling,